Gate-valve



(No Model.)

E. ALLT. Gate Valve.

No. 23 Y Patented 0ct. 12, 1880.

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UNITED ISTATES PATENT OFFICE.

EDMIIND ALLT, OF BROOKLYN, NEW YORK.

GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 233,180, dated October12, 1880.

I Application filed June 24, 1880. (No model.)

To all whom it may concern Be it known that I, EDMUND ALLT, of Brooklyn,in the county of Kings and State of N ew York, have invented a new anduseful Improvement in Gate Valves, of which the following is aspecification.

Heretofore in those gate-valves which are forced to their sea-ts bymeans of oppositelyinclined planes or adjoining surfaces two valvediskshave been use l. One method has been to arrange the planes of the disksto slide laterally or obliquely upon each other. The objection to thisis, that it causes the disks to separate laterally and bind against thesides of the recess in which they move. Another method was to move thedisks vertically; but as two disks were used there was a lack ofsimplicity and strength.

The object of my improvements is to avoid the above objections andproduce a sliding gate-valve simpler, stronger, and more readilyadjustable than has heretofore been known or used. I attain this objectby using only one valve-disk, so arranged, however, as to slide upon afixed incline-plane surface or surfaces formed on the interior of therecess, in which the valve-disk is moved upward or downward by thevalve-stem, and sliding id such a manner that it moves vertically, andwhen it reaches the bottom of the inclined plane presses rmly againstits valve-seat.

In the accompanying drawings, Figure lis a vertical central section of agate-valve audits chamber embodying my invention. Fig. 2 is anothersimilar vertical section, showing the same apparatus with the valve-diskremoved. Fig. 3 is a cross vertical section of the valvechamber, withthe valve-disk and valve-stem removed. Fig. 4l is a view of that side ofthe valve-disklwhieh comes in contact with the inclined surface. Fig. 5is a perspective view of the valve-disk, and Fig. 6 is a verticalsection of a modified form of the valve-disk.

My improved gate-valve operates as follows The valve-stem A and thevalve disk or body B are fitted together by slipping the flanged end aof the valve-stem into the recess b on the top of the valve-disk. Thestem and disk are then inserted into the valve-chamber C, so that theinclined ribs m, Figs. l to 5, of the valve, and the fixed inclinedsurface d in the chamber, Figs. l and 2, come in contact, the surface msliding on the surface d as the valvestem A is screwed down until thefacetof the valve-disk B will press firmly against its seat D in thechamber and close the aperture E. (Shown in cross-section in Fig. 3.)This aperture E is opened by an operation the reverse of thatjustdescribed.

In Figs. l and 2 one of lthe fixed inclined projecting ribs forming thesurfaces d is shown, on which surfaces the valve-disk slides. Each ofthese ribs is a projection of the form indicated upon the interior ofthe valve-chamber at or near one end thereof. f

The valve-disk B (shown in the drawings, Figs. 4, 5, and 6,) has itsinclined ribs m at the back-i. e., opposite its face t-and hasprojecting lugs g, which hold the disk steady by fitting between theribs d of the valve-chamber; but in lieu of the lugs g the ribs m may begrooved to receive the ribs d, or -vice versa 5 or they (the lugs g) mayreceive the ribs d between them, instead of catching between said ribsd. But while I prefer the above form I do not limit myself to it, as anydisk which is adapted to move as described to close the aperture issufficient.

I also construct the racc t' of the valve-disk which comes in contactwith the seat D iu the following manner, which I consider novel with me,and preferable, though any other construction of that face which willenable it to close the aperture is sufficient: A recess is cut into thisface of the metal valve, so as to leave only a narrow rim, h, around theoutside edge. In this recess a disk, j, of rubber or suitable packing,is placed, so as to form an even outer surface somewhat beyond the edgeof the rim lz. This rubber is fastened in place by a screw, Z, passedthrough the center of the face 5 but the head of said screw is let intoa recess in the face of the disk j, so that said screw-head will notinterfere with the vertical movement of the valve to and from its seat.The modification shown in Fig. 6 shows, in lieu of the central screw, l,an outer annular screw, lx, engaging over a thread of the rim h andfitting into a sunken annulus near the edge of the disk j. Thisconstruction is best adapted for larger valves having large disks j.

In Figs. l and 3 are also shown upright IOO guide-ribs k lr, formed inthe valve-chamber above the seat D. These are formed by cutting away themetal on the center portion of the side adjacent to and above the seatl), leaving the ribs kot' this chamber projecting. This is advantageousin lesseni'n g the surface exposed to friction as the valve-diskdescends and ascends.

Having thus described my invention, what I desire to claim and secure byLetters Patent is- 1. The combination of a single gate-valve, B, havinginclined back m and upright face i, with one or more fixed inclinedribs, 11, formed Within the valve-chamber (l, along which ribs the valveis moved to and oli' its seat, and with a stem, A, to which said valveis directly and bodily attached, and on which it can slidehorizontally,substantially asherein shown and described.

2. As a new article ot' manufacture, a sliding valve, ll, having on itsface a recess aml an overhanging rim, h, in combination with apackingdisk,j, and with a screw sunk into said diskj and uniting it withthe valve B, all 25 amm ged so that the valve is capable of sliding ouits vertical ijush face, substantially as described.

3. The chamber C, having ribs d and k and seat D, in combination withthe valve B, sub- 3o stantially as herein shown and described.

4. The stem A, having ange or head a, in combination with the singlesuspended valve disk B, having packing j, and with the case C, havingfixed rib or ribs d. and seat D, sub- 35 stantially as herein shown anddescribed.

5. The valve B, having inclined back m, upright face i, and guide lug orlugs g, in combination with the case O, containing the fixed inclinedrib or ribs f1, substantially as herein 4o shown and described.

EDMUND ALLT.

Witnesses WiLLIAM H. C. SMlTH, WlLLY E. ScHUL'rz.

